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No raster and sound
normal
inspectR501,C5
07,V503 etc.
Inspect whether the voltage on the
yes
Inspect the voltage such as
12V,9V,B1,5V are normal or not
Normal
Inspect
N902,V924,
V925 etc.
no display charactor
no
有
Inspect L902 C926 C925
abnormal
Replace
the
component
No raster and sound
Check the Fuse
Inspect whether the voltage 115V 180Vloaded voltage is nornal or not
normal
collector of V552 is 24V or not
Inspect
CPU power control
circuit
Fault in line circuit
or N201
next page
No display charactor
Display black character or not
Inspect the circuit from V922
R915 C450 to T402(pin5) or the
circuit from V923 C921 R914 to
N402(7)
Brocken
Normal
no
Inspect
V552
or
power soured
circuit
abnormal
Yes
see
Replace the
rectifier
Inspect
the
N901(22~24) to N201(14~16)
normal
abnormal
Inspect the voltage on all
loaded resistor
Inspect whether the
the
rectifier is short or
not
Cause of
the load
yes
circuit
from
abnormal
No
33
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